<!DOCTYPE html>
<html>
<head>
<title>State Chart With Incremental Saves</title>
<meta name="description" content="A finite state machine chart with editable and interactive features." />
<!-- /* Copyright 1998-2016 by Northwoods Software Corporation. */ -->
<meta charset="UTF-8">
<script src="go.js"></script>
<link href="../assets/css/goSamples.css" rel="stylesheet" type="text/css" />  <!-- you don't need to use this -->
<script src="goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
<script id="code">
  function init() {
    if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this
    var $ = go.GraphObject.make;  // for conciseness in defining templates

    myDiagram =
      $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
        {
          // start everything in the middle of the viewport
          initialContentAlignment: go.Spot.Center,
          // have mouse wheel events zoom in and out instead of scroll up and down
          "toolManager.mouseWheelBehavior": go.ToolManager.WheelZoom,
          // support double-click in background creating a new node
          "clickCreatingTool.archetypeNodeData": { text: "new node" },
          "InitialLayoutCompleted": function(e) { showIncremental("InitialLayout"); },
          "ModelChanged": function(e) {
            if (e.isTransactionFinished) {
              // this records each Transaction as a JSON-format string
              showIncremental(myDiagram.model.toIncrementalJson(e));
            }
          },
          // enable undo & redo
          "undoManager.isEnabled": true
        });

    // when the document is modified, add a "*" to the title and enable the "Save" button
    myDiagram.addDiagramListener("Modified", function(e) {
      var button = document.getElementById("SaveButton");
      if (button) button.disabled = !myDiagram.isModified;
      var idx = document.title.indexOf("*");
      if (myDiagram.isModified) {
        if (idx < 0) document.title += "*";
      } else {
        if (idx >= 0) document.title = document.title.substr(0, idx); 
      }
    });

    // define the Node template
    myDiagram.nodeTemplate =
      $(go.Node, "Auto",
        new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
        // define the node's outer shape, which will surround the TextBlock
        $(go.Shape, "RoundedRectangle",
          {
            parameter1: 20,  // the corner has a large radius
            fill: $(go.Brush, "Linear", { 0: "rgb(254, 201, 0)", 1: "rgb(254, 162, 0)" }),
            stroke: "black",
            portId: "",
            fromLinkable: true,
            fromLinkableSelfNode: true,
            fromLinkableDuplicates: true,
            toLinkable: true,
            toLinkableSelfNode: true,
            toLinkableDuplicates: true,
            cursor: "pointer"
          }),
        $(go.TextBlock,
          {
            font: "bold 11pt helvetica, bold arial, sans-serif",
            editable: true  // editing the text automatically updates the model data
          },
          new go.Binding("text", "text").makeTwoWay())
      );

    // unlike the normal selection Adornment, this one includes a Button
    myDiagram.nodeTemplate.selectionAdornmentTemplate =
      $(go.Adornment, "Spot",
        $(go.Panel, "Auto",
          $(go.Shape, { fill: null, stroke: "blue", strokeWidth: 2 }),
          $(go.Placeholder)  // this represents the selected Node
        ),
        // the button to create a "next" node, at the top-right corner
        $("Button",
          {
            alignment: go.Spot.TopRight,
            click: addNodeAndLink  // this function is defined below
          },
          $(go.Shape, "PlusLine", { desiredSize: new go.Size(6, 6) })
        ) // end button
      ); // end Adornment

    // clicking the button inserts a new node to the right of the selected node,
    // and adds a link to that new node
    function addNodeAndLink(e, obj) {
      var adorn = obj.part;
      e.handled = true;
      var diagram = adorn.diagram;
      diagram.startTransaction("Add State");

      // get the node data for which the user clicked the button
      var fromNode = adorn.adornedPart;
      var fromData = fromNode.data;
      // create a new "State" data object, positioned off to the right of the adorned Node
      var toData = { text: "new" };
      var p = fromNode.location.copy();
      p.x += 200;
      toData.loc = go.Point.stringify(p);  // the "loc" property is a string, not a Point object
      // add the new node data to the model
      var model = diagram.model;
      model.addNodeData(toData);
      
      // create a link data from the old node data to the new node data
      var linkdata = {
        from: model.getKeyForNodeData(fromData),  // or just: fromData.id
        to: model.getKeyForNodeData(toData),
        text: "transition"
      };
      // and add the link data to the model
      model.addLinkData(linkdata);
      
      // select the new Node
      var newnode = diagram.findNodeForData(toData);
      diagram.select(newnode);
      
      diagram.commitTransaction("Add State");
      
      // if the new node is off-screen, scroll the diagram to show the new node
      diagram.scrollToRect(newnode.actualBounds);
    }

    // replace the default Link template in the linkTemplateMap
    myDiagram.linkTemplate =
      $(go.Link,  // the whole link panel
        {
          curve: go.Link.Bezier, adjusting: go.Link.Stretch,
          reshapable: true, relinkableFrom: true, relinkableTo: true
        },
        new go.Binding("points").makeTwoWay(),
        new go.Binding("curviness", "curviness"),
        $(go.Shape,  // the link shape
          { strokeWidth: 1.5 }),
        $(go.Shape,  // the arrowhead
          { toArrow: "standard", stroke: null }),
        $(go.Panel, "Auto",
          $(go.Shape,  // the label background, which becomes transparent around the edges
            {
              fill: $(go.Brush, "Radial",
                      { 0: "rgb(240, 240, 240)", 0.3: "rgb(240, 240, 240)", 1: "rgba(240, 240, 240, 0)" }),
              stroke: null
            }),
          $(go.TextBlock, "transition",  // the label text
            {
              textAlign: "center",
              font: "10pt helvetica, arial, sans-serif",
              stroke: "black",
              margin: 4,
              editable: true  // editing the text automatically updates the model data
            },
            new go.Binding("text", "text").makeTwoWay())
        )
      );

    // read in the JSON-format data from the "mySavedModel" element
    load();
  }

  // Show the diagram's model in JSON format
  function save() {
    document.getElementById("mySavedModel").value = myDiagram.model.toJson();
    myDiagram.isModified = false;
    showIncremental("");
  }
  function load() {
    var model = go.Model.fromJson(document.getElementById("mySavedModel").value);
    // establish GraphLinksModel functions:
    // node data id's are odd numbers
    model.makeUniqueKeyFunction = function(model, data) {
      var i = model.nodeDataArray.length * 2 + 1;
      while (model.findNodeDataForKey(i) !== null) i += 2;
      data.id = i;  // assume Model.nodeKeyProperty === "id"
      return i;
    };
    // link data id's are even numbers
    model.makeUniqueLinkKeyFunction = function(model, data) {
      var i = model.linkDataArray.length * 2 + 2;
      while (model.findLinkDataForKey(i) !== null) i += 2;
      data.id = i;  // assume GraphLinksModel.linkKeyProperty === "id"
      return i;
    };
    myDiagram.model = model;
    showIncremental("");
  }

  function showIncremental(str) {
    // show the last transaction as an incremental update in JSON-formatted text
    var element = document.getElementById("myTransaction");
    // don't show anything upon the initial layout
    if (element.value === "InitialLayout") str = "";
    element.value = str;

    // show the differences between this model and the saved model
    // as an incremental update in JSON-formatted text
    var element2 = document.getElementById("myDifferences");
    if (str !== "") {
      var savedModel = go.Model.fromJson(document.getElementById("mySavedModel").value);
      element2.value = savedModel.computeJsonDifference(myDiagram.model);
    } else {
      element2.value = "";
    }
  }
</script>
</head>
<body onload="init()">
<div id="sample">
  <div id="myDiagramDiv" style="background-color: whitesmoke; border: solid 1px black; width: 100%; height: 400px"></div>
  <p>
  This sample is derived from the <a href="stateChart.html">State Chart</a> sample.
  This makes use of the new <a>GraphLinksModel.linkKeyProperty</a> property
  and the <a>Model.toIncrementalJson</a> and <a>Model.applyIncrementalJson</a> methods.
  It also demonstrates custom functions for <a>Model.makeUniqueKeyFunction</a> and
  <a>GraphLinksModel.makeUniqueLinkKeyFunction</a>, which assign odd numbers to new node
  data and even numbers to new link data.
  Unlike most models, this example uses "id" as the name of the <a>Model.nodeKeyProperty</a> rather than "key".
  </p>
  Last <a>Transaction</a> saved in incremental JSON format:
  <textarea id="myTransaction" style="width:100%;height:200px"></textarea>
  Difference between current <a>Model</a> and model saved in JSON-format text below:
  <textarea id="myDifferences" style="width:100%;height:200px"></textarea>
  <button id="SaveButton" onclick="save()">Save</button>
  <button onclick="load()">Load</button>
  Diagram Model saved in JSON format:
  <br />
  <textarea id="mySavedModel" style="width:100%;height:300px">
{ "nodeKeyProperty": "id",
  "linkKeyProperty": "id",
  "nodeDataArray": [
    { "id": 1, "loc": "120 120", "text": "Initial" },
    { "id": 3, "loc": "330 120", "text": "First down" },
    { "id": 5, "loc": "226 376", "text": "First up" },
    { "id": 7, "loc": "60 276", "text": "Second down" },
    { "id": 9, "loc": "226 226", "text": "Wait" }
  ],
  "linkDataArray": [
    { "id": 2, "from": 1, "to": 1, "text": "up or timer", "curviness": -20 },
    { "id": 4, "from": 1, "to": 3, "text": "down", "curviness": 20 },
    { "id": 6, "from": 3, "to": 1, "text": "up (moved)\nPOST", "curviness": 20 },
    { "id": 8, "from": 3, "to": 3, "text": "down", "curviness": -20 },
    { "id": 10, "from": 3, "to": 5, "text": "up (no move)" },
    { "id": 12, "from": 3, "to": 9, "text": "timer" },
    { "id": 14, "from": 5, "to": 1, "text": "timer\nPOST" },
    { "id": 16, "from": 5, "to": 7, "text": "down" },
    { "id": 18, "from": 7, "to": 1, "text": "up\nPOST\n(dblclick\nif no move)" },
    { "id": 20, "from": 7, "to": 7, "text": "down or timer", "curviness": 20 },
    { "id": 22, "from": 9, "to": 1, "text": "up\nPOST" },
    { "id": 24, "from": 9, "to": 9, "text": "down" }
  ]
}
</textarea>
</div>
</body>
</html>
